Minnesota Gov. Mark Dayton talks about his proposed budget during a news conference Tuesday, Jan. 22, 2013, at the Minnesota Department of Revenue in St. Paul. (Pioneer Press: Ben Garvin)

About two dozen Minnesota cities and counties whose sales taxes piggyback on the state's would see a gusher of new money if Gov. Mark Dayton's proposed sales tax expansion prevails.

Most of the local taxes are temporary and dedicated to specific purposes, which could mean quicker repayment of public debt on civic centers, airports, stadiums and sewer projects. That would mean the local sales taxes would end sooner. Other cities have more flexibility on how they could spend a windfall from taxes that either never expire or won't for decades.

Several Twin Cities-area counties impose a quarter-cent sales tax to pay for regional mass transit projects, and the amount raised from that would shoot up.

Little attention has been paid to the trickle-down effect of Dayton's sales tax proposal since the Democratic governor released his budget plan last week. Dayton's budget would subject a range of consumer and business services -- haircuts, tattoos, legal bills and accountant fees among them -- to the tax while lowering the state's overall rate from 6.875 percent to 5.5 percent.

As it is now structured, the local sales taxes would remain at their current rates but apply to everything the state considers taxable.

Early estimates by the Minnesota Department of Revenue provided to the Associated Press show that cities and counties with their own sales taxes could expect to take in 60 percent more than they take in now.

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Counties would be in line for $79 million more in 2014; cities with extra sales taxes would gain a combined $60 million.

The actual amount each city or county could expect would vary because consumption of the newly taxed goods or services isn't the same from place to place.

Duluth's 1 percent sales tax could generate an extra $8 million per year, according to a separate House Research estimate.

Mayor Don Ness said it would come at a crucial time, given a recent court loss that deprives the city of $6 million in annual payments from an American Indian band that operates a downtown casino.

"We've been on the razor's edge with our budget for over a decade in the city of Duluth, and while we're getting close to finding stability, we still have a long way to go," he said Monday, Jan. 28.

Ness envisions using the revenue increase to plug the hole from the casino decision and pay off other debt, but he's well aware that the expansion is no sure thing.

St. Paul, which levies a half-cent sales tax, is also taking a wait-and-see mentality. Sixty percent of those proceeds go for neighborhood or cultural development, with the rest used to repay debt from the city's convention center.

"Any assistance we can get to ... help further our economic development is good for us," said Joe Campbell, communications director for Mayor Chris Coleman.

According to House researchers, the $16.4 million St. Paul's 0.5 percent sales tax brought in 2011 would have grown by $10.2 million had the changes already been in place.

One of Minnesota's most lucrative local sales taxes is the 0.15 percent imposed in Hennepin County to pay construction bonds for the new Twins ballpark. In 2011, the tax brought in $31 million, a slice of which the county was allowed to use on libraries and youth recreation fields. If the expanded base had been in place that year, House researchers estimate it would have meant almost $20 million more. The tax is due to expire once the Target Field borrowing is paid off.

Hennepin County Board Chairman Mike Opat said the faster repayment would mean less in interest costs on bonds that had a 30-year lifespan when they were sold in 2007.

"We would turn off that tax. There are very narrow uses for that tax, and it's not the desire of the county board to leave that on," he said.

In 1971, the Legislature prohibited new or increased local sales taxes as a way to centralize collections and reduce disparities that reward cities with the most political clout. But it wasn't long before cities started pressing legislators for exemptions, with some success. Most were enacted only after local voters approved them. Three new sales taxes kicked in last year -- in Fergus Falls, Hutchinson and Lanesboro.

While most of the taxes initially were connected to a specific capital project, the Legislature conceivably could stretch their purpose and longevity. Dayton's administration was leaving that up to lawmakers, said Janelle Tummel, a Revenue Department spokeswoman.

One wrinkle involves the constitutional amendment voters passed in 2008 to raise the state sales tax for specific programs. That amendment permits lawmakers to shave the tax rate if the sales tax base is expanded -- so the revenues match the projected income under the prior arrangement.

The added 0.375 percent tax produces hundreds of millions of dollars per year dedicated to programs protecting drinking water, enhancing wetlands and habitat, boosting the arts and otherwise preserving Minnesota's environmental and cultural legacy. Dayton has recommended slicing the rate connected with the Legacy Amendment to 0.234 percent.